export declare const isUndefined: (input: any) => boolean; export declare const notUndef: (input: any) => boolean; export declare const isEmpty: (input: any) => boolean; export declare const notEmpty: (input: any) => boolean; export declare const notZero: (input: any) => boolean; export declare const isZero: (input: any) => boolean; export declare const isEmail: (input: any) => boolean; export declare const isNaturalNumber: (input: any) => boolean; export declare const isInteger: (input: any) => boolean; export declare const isFloat: (input: any) => boolean; export declare const isString: (input: any) => boolean; export declare const isBoolean: (input: any) => boolean; export declare const isObject: (input: any) => boolean; export declare const isLatitude: (input: any) => boolean; export declare const isLongitude: (input: any) => boolean; export declare const isMaxNumber: (input: number, n: number) => boolean; export declare const isMinNumber: (input: number, n: number) => boolean; export declare const isMaxString: (input: string, n: number) => boolean; export declare const isMinString: (input: string, n: number) => boolean; declare type Primitive = string | number | boolean; export declare const inEnum: (input: Primitive, array: Primitive[]) => boolean; export declare const isConstructor: (value: any) => boolean; export {};